I understand, dear Iceblock, that you are in a situation where you already have too many dommes in your mind. My suggestion is to try the online way to have a taste of how it could be and, if you like it more than your current situation, just have a talk with your IRL domme, because any fetish should make YOU happy as well. Are you not satisfied? Talk with your domme. Are you afraid she will get mad? Let her know your issue.
Honesty and communications are the key to make this kind of reationships work.
That said I am open to new subs, at the moment, You can get an idea of what I  like and how I work by visiting my presentation here on the forum. I am sure you will find a way to enjoy findom and at the same time you will not have to cheat on anyone. just be honest.